This JavaScript GitHub Action gets the billing for the current month's GitHub Actions.

In this example, the Slack notification section is implemented using the Slack Notify - GitHub Action.

1. Create a workflow file
   Please add to an existing workflow file with reference to the following.

   name: Notify the billing of GitHub Actions for the current month to Slack
   on:
     schedule:
       # ref: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule
       - cron: '0 9 * * 1'
   
   jobs:
     check-github-actions-usage:
       runs-on: ubuntu-latest
       steps:
         - name: Checkout
           uses: actions/checkout@v3
         - uses: actions/setup-node@v3
           with:
             node-version: 18
         - name: Get billing for GitHub Actions
           id: get-billing-for-github-actions
           uses: keita-hino/[email protected]
           with:
             # For organization accounts, set the `org` parameter.
             account-type: user
             github-token: ${{ secrets.PAT_ACCESS_TOKEN }}
         - name: Slack Notification
           uses: rtCamp/action-slack-notify@v2
           env:
             SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
             SLACK_TITLE: Usage of GitHub Actions for the current month
             MSG_MINIMAL: true
             SLACK_MESSAGE: > 
               The usage limit of GitHub Actions for the current plan is *${{steps.get-billing-for-github-actions.outputs.included-minutes}}* minutes.
               The usage for this month is *${{steps.get-billing-for-github-actions.outputs.total-minutes-used}}* minutes, and there are *${{steps.get-billing-for-github-actions.outputs.usable-minutes}}* minutes remaining.
               The next reset day is in *${{steps.get-billing-for-github-actions.outputs.days-left-in-billing-cycle}}* days.

2. Create a PAT
   To use this workflow, you will need to create a Personal Access Token (PAT) with the necessary permissions.

   • For User accounts, grant the plan permissions to your PAT.
     
   • For Organization accounts, grant the Organization administration permissions to your PAT.
     

3. Set the created PAT as a secret
   Please set the created PAT as a secret named ACCESS_TOKEN.
   https://docs.github.com/en/actions/security-guides/encrypted-secrets#creating-encrypted-secrets-for-a-repository

4. Set the created SLACK_WEBHOOK as a secret Please refer to the following instructions to set up SLACK_WEBHOOK as a secret.
   https://github.com/rtCamp/action-slack-notify#usage

Name	Description
account-type	user or org. The default is user.
github-token	Personal Access Token (PAT)

Name	Description
included-minutes	The amount of free GitHub Actions minutes available
total-minutes-used	The sum of the free and paid GitHub Actions minutes used
usable-minutes	The value obtained by subtracting total-minutes-used from included-minutes
days-left-in-billing-cycle	Numbers of days left in billing cycle

All scripts in this project are released under the MIT License.